Extend visibility support

Also renamed PSL_PUBLIC -> PSL_API (conforming to other known libraries).

configure.ac

@@ -17,6 +17,9 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 dnl Check that compiler understands inline
 AC_C_INLINE
 
+dnl Check for visibility support
+gl_VISIBILITY
+
 #
 # Generate version defines for include file
 #

include/libpsl.h.in

@@ -40,8 +40,16 @@
 #define PSL_VERSION_PATCH @LIBPSL_VERSION_PATCH@
 #define PSL_VERSION_NUMBER @LIBPSL_VERSION_NUMBER@
 
-#ifndef PSL_PUBLIC
+#ifndef PSL_API
-# define PSL_PUBLIC
+#if defined BUILDING_PSL && HAVE_VISIBILITY
+#  define PSL_API __attribute__ ((__visibility__("default")))
+#elif defined BUILDING_PSL && defined _MSC_VER && !defined PSL_STATIC
+#  define PSL_API __declspec(dllexport)
+#elif defined _MSC_VER && !defined PSL_STATIC
+#  define PSL_API __declspec(dllimport)
+#else
+#  define PSL_API
+#endif
 #endif
 
 #ifdef  __cplusplus
@@ -81,112 +89,112 @@ typedef enum {
 typedef struct _psl_ctx_st psl_ctx_t;
 
 /* frees PSL context */
-PSL_PUBLIC
+PSL_API
 void
 	psl_free(psl_ctx_t *psl);
 
 /* frees memory allocated by libpsl routines */
-PSL_PUBLIC
+PSL_API
 void
 	psl_free_string(char *str);
 
 /* loads PSL data from file */
-PSL_PUBLIC
+PSL_API
 psl_ctx_t *
 	psl_load_file(const char *fname);
 
 /* loads PSL data from FILE pointer */
-PSL_PUBLIC
+PSL_API
 psl_ctx_t *
 	psl_load_fp(FILE *fp);
 
 /* retrieves builtin PSL data */
-PSL_PUBLIC
+PSL_API
 const psl_ctx_t *
 	psl_builtin(void);
 
 /* retrieves most recent PSL data */
-PSL_PUBLIC
+PSL_API
 psl_ctx_t *
 	psl_latest(const char *fname);
 
 /* checks whether domain is a public suffix or not */
-PSL_PUBLIC
+PSL_API
 int
 	psl_is_public_suffix(const psl_ctx_t *psl, const char *domain);
 
 /* checks whether domain is a public suffix regarding the type or not */
-PSL_PUBLIC
+PSL_API
 int
 	psl_is_public_suffix2(const psl_ctx_t *psl, const char *domain, int type);
 
 /* checks whether cookie_domain is acceptable for domain or not */
-PSL_PUBLIC
+PSL_API
 int
 	psl_is_cookie_domain_acceptable(const psl_ctx_t *psl, const char *hostname, const char *cookie_domain);
 
 /* returns the longest not registrable domain within 'domain' or NULL if none found */
-PSL_PUBLIC
+PSL_API
 const char *
 	psl_unregistrable_domain(const psl_ctx_t *psl, const char *domain);
 
 /* returns the shortest possible registrable domain part or NULL if domain is not registrable at all */
-PSL_PUBLIC
+PSL_API
 const char *
 	psl_registrable_domain(const psl_ctx_t *psl, const char *domain);
 
 /* convert a string into lowercase UTF-8 */
-PSL_PUBLIC
+PSL_API
 psl_error_t
 	psl_str_to_utf8lower(const char *str, const char *encoding, const char *locale, char **lower);
 
 /* does not include exceptions */
-PSL_PUBLIC
+PSL_API
 int
 	psl_suffix_count(const psl_ctx_t *psl);
 
 /* just counts exceptions */
-PSL_PUBLIC
+PSL_API
 int
 	psl_suffix_exception_count(const psl_ctx_t *psl);
 
 /* just counts wildcards */
-PSL_PUBLIC
+PSL_API
 int
 	psl_suffix_wildcard_count(const psl_ctx_t *psl);
 
 /* returns mtime of PSL source file */
-PSL_PUBLIC
+PSL_API
 time_t
 	psl_builtin_file_time(void);
 
 /* returns SHA1 checksum (hex-encoded, lowercase) of PSL source file */
-PSL_PUBLIC
+PSL_API
 const char *
 	psl_builtin_sha1sum(void);
 
 /* returns file name of PSL source file */
-PSL_PUBLIC
+PSL_API
 const char *
 	psl_builtin_filename(void);
 
 /* returns name of distribution PSL data file */
-PSL_PUBLIC
+PSL_API
 const char *
 	psl_dist_filename(void);
 
 /* returns library version string */
-PSL_PUBLIC
+PSL_API
 const char *
 	psl_get_version(void);
 
 /* checks library version number */
-PSL_PUBLIC
+PSL_API
 int
 	psl_check_version_number(int version);
 
 /* returns whether the built-in data is outdated or not */
-PSL_PUBLIC
+PSL_API
 int
 	psl_builtin_outdated(void);
 

src/Makefile.am

@@ -7,7 +7,9 @@ CLEANFILES = suffixes_dafsa.c
 lib_LTLIBRARIES = libpsl.la
 
 libpsl_la_SOURCES = psl.c lookup_string_in_fixed_set.c
-libpsl_la_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include -DPSL_DISTFILE=\"$(PSL_DISTFILE)\"
+libpsl_la_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include -DPSL_DISTFILE=\"$(PSL_DISTFILE)\" \
+  $(CFLAG_VISIBILITY) -DBUILDING_PSL
+
 # include ABI version information
 libpsl_la_LDFLAGS = -version-info $(LIBPSL_SO_VERSION)
 if WITH_LIBICU